It's not finished yet, but working with the 2000' audi tt cluster on my table

what you need:
* amd64 linux with fuse support (ask for x86 version, if you want to test it before source release)
* obd diagnostic cable which supports kw1281 and is supported by linux, most cheap cables comes with ftdi rs232 converter and work fine (search amazon.com for B007PACPYW, costs about 10$)

USE AT YOUR OWN RISK
it is possible to modify data by the kw1281 protocol, functions are not implented, but bugs can come to features... (i don't think so, but be warned)